Generally works as expected, but Level 14 is broken, so that's as far as you can go. The playing filed is shifted down and to the right so the paddle is no longer visible on the screen.There are reasonable power ups including flaming balls that penetrate the blocks, a laser type beam, speed up, slow down, widen and narrow paddle, extra lives.On Big Sur, iOS games work, but the paddle movement requires you press the trackpad continuously. Here paddle movement works iwth one finger as expected.Things that are not great are the cursor is not hidden. A minor annoyance easily ignored.A bit worse is that your progress is not saved, so you always start over at the first level.And the levels aren't all that imaginative. They're fairly basic, but if I'm listening to a podcast, or just want a simple Araknoid type game that works on Mac, this one does.